There was a guy in front of me, just before the Epcot center fireworks, trying to take a picture of the scene around the lake using a P&S with the flash on. I don't know how many stadiums you could fit in that space, but it's a heck of a lot. I watched his LCD pop up each time with a black image. Then he'd mess with the camera for a few seconds and try again, still with flash. Same result, of course.

But even that is nothing compared to watching someone shoot pictures of the moon with the flash on.

The answer to why people do this is AUTO MODE. These people use nothing else, and so deserve what they get.